Side by side

Longines LONGINES SPIRIT FLYBACK PROTOTYPEvsZelos GT

The numbers, the dial colors, the calibers — laid out so you can stop flipping between tabs.

LONGINES SPIRIT FLYBACK PROTOTYPE
LonginesLONGINES SPIRIT FLYBACK PROTOTYPE
MSRP $7,400
GT
ZelosGT
MSRP $499

At a glance

6 of 29 specs differ
Diameter
LONGINES SPIRIT FLYBACK PROTOTYPE42mm
GT42mm
Power Reserve
LONGINES SPIRIT FLYBACK PROTOTYPE40h
GT40h
Water Resistance
LONGINES SPIRIT FLYBACK PROTOTYPE100m
GT100m
MSRP
LONGINES SPIRIT FLYBACK PROTOTYPE$7,400
GT$499

Full specifications

Case

3 specs
Thickness
17mm
10.8mm
Lug-to-Lug
49.5mm
42mm
Material
Stainless Steel
316L Stainless Steel

Crystal & Dial

1 specs
Dial Color
Green
SS - Azzurro

Movement

1 specs
Caliber
L791.4
Miyota 9133

Pricing

1 specs
MSRP
$7,400
$499

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What people say

Owners + reviewers, side by side

Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.

LONGINES SPIRIT FLYBACK PROTOTYPE

Owners widely praise the Longines Spirit Flyback Prototype for its attractive finishing, COSC-certified movement, and value as a flyback chronograph. Reviewers highlight its refined 39.5mm case and simplified dial, while some owners appreciate the reduced thickness and improved wearability compared to larger variants, with a lug-to-lug distance noted as potentially long for smaller wrists. The watch features a 68-hour power reserve and a bespoke L791.4 movement. However, the case thickness is a consistent point of discussion, with multiple sources citing 17mm, though some reviewers suggest thoughtful design makes it wear closer to 13.5-14mm. Owners are split on the dial's aesthetic, with some preferring previous configurations with gold subdial rings and concentric textures over the current flat matte dial and cut-off numbers. The leather strap is also noted as stiff and pinching.

Zelos GT

The Zelos GT is lauded for its value and bold design, with owners highlighting the cool power reserve meter and superb 3-point micro-adjust bracelet. Some owners find the case and lugs could hug the wrist better, and the bracelet is noted as being quite long, requiring significant link removal for a 7.1-inch wrist. The dark green dial, while inspired by Lamborghini, is described as appearing mostly black. Overall, owners rate the Zelos GT highly for its value and the quality of its bracelet at the price point.

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